0.05 kg of steam at 15 bar is contained in a rigid vessel of volume 0.0076 m 3 , what is the temperature of steam? If the vessel is cooled, at what temperature will the steam be just dry and saturated? The cooling is continued until the pressure in the vessel is 11.0 bar. Calculate the final dryness fraction of steam and heat rejected between initial and final states.

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.